Ive posted before ...

It wasn't pleasant first time to post, but I understand your minds now, so will make it easier now....

I'm something you might hear and know, I help you learn, and sometimes grow. My length is long, but don't be shy, Convert me back and you’ll know why.

Base64: U2VlIG1lLCBoZWFyIG1lLCBhbmQgcmVwZWF0IG1lLg==

What am I?

Wait for more, rewards will be included later!